Steam-generating plant



Nov. 20, 1928.

J.H.HUME

STEAM GENERATING PLANT Q Filed March 25, 1927 2 Sheets-Sheet 1 d'M /M QM Nov. 20, 1928.

' J. H. HUME STEAM GENERATING PLANT Filed March 25, 1927 2 Sheets-Sheet Fl G. 4

Heb,

Patented Nov. 20, 1928.

JAMES HOWD'EN HUME, F GLASGOW, SCOTLAND.-

STEAM-GENERATING PLANT.

Application filed March 25, 1927, Serial No.

This invention relates to a steam generating plant comprising a steam boiler or generator proper, an economizer, and preferably also a steam superheater, and aims in the first place to provide an improved construction which permits of most advantageous utilizai tion of the heat of combustion and intensive circulation besides protecting the superheater tubes from exposure to excessive temperatures and limiting the degree of superheat.

The steam generating plant of the invention comprises essentially a boiler of the cylindrical type having at least one internally fired furnace, an economizer spaced from the back end of the boiler and including substantially vertical or slightly inclined tubes connected to upper and lower drums, and a circulating system at the back end of the boiler comprising upcast tubes nearer the back end of the boiler than the cconomizer tubes, with or without a steam superheater located intermediate the-upcast tubes and the economizcr tubes, so as to be screened by the upcast tubes.

' The econ-omizer drums are preferably disposed with their axes horizontal and trans-- verse to the axis ofthe cylindrical boiler shell, connection being taken to either drum for the introduction of feed water.

The steam spaces of the upper drum and of the boiler are connected directly or indirectly.

The lower drum of the economizer has no communication with the boiler otherwise than by way of the tubes which connect the lower drum with the upper drum.

In a preferred construction there is located at about the level of the bottom of the boiler, between the boiler and the lower economizer drum, a water box or drum to which are led downcomer pipes from the upper economizer drum and from which are led connectionst-o the boiler including upcast circulating tubes connected to the back of the boiler about the water level'therein, a return connection being taken from the bottom or near the bottom of the boileia The disposition of the connections is such that feed water admitted to the economizer circulates between the economizer drums, a certain proportion flowing from the upper economizer drum to the water box or drum of the circulating system and there joining 178,234, and in Great Britain May 27, 1926.

water circulating between the last named water box or drumand the boiler.

Between the economizcr tubes and the upcast circulating tubes is preferably provided a steam superheater which may comprise substantially vertical or slightly inclined tubes joined at their upper ends to manifolds or headers or toa drum with an internal partition separating the saturated steam inlet from the superheated steam outlet andat their lower ends to a manifold or header or drum or the like; or the superheater may be of other type.

In any case the superheater, if provided, isscreened by the water circulating tubes whichtake up a suitable proportion of the heat from the gases leaving the boiler furnace.

It is important that of the ec-onomizer drums only the upper drum has a connection to the boiler.

In the accompanying drawings Fig. 1 is a vertical longitudinal section of a steam generating plant according to the invention; Fig. 2 is a similiar view to Fig. 1 showing an alternative arrangement; Figs, 3 and- 4 are fragmentary detail views.

The steaingenerating plant illustrated comprises in all the forms represented a boiler 1 of the cylindrical type having an internally fired furnace or furnaces 2, an economizer spaced from'the backend of the boiler 1 and including substantially vertical or slightly inclined tubes 3 connected to an upper drum 4 and a lower drum 5, a circulating system at the back end of the boiler 1 comprising upcast: tubes 6 nearer the back end of the boiler 1 than the economizer tubes 3, and a steam superheater located intermediate the economizer tubes 3 and the tubes 6, the water circulating in the tubes 6 presenting a waterscreen whereby to screen the superheater.

The drums 4 and 5 are shown disposed with their axeshorizontal and transverse to the axis of the boiler 1, connection being. taken as at 7 to the upper drum or to the lower drum for the introduction of feed water.

The steam space ofthe upper drum '4" may be connected directly to the steam space of the boiler 1 or may be connected by the pipe 8 to the inlet compartment ofv a superheater drum 14 to which is also connected a pipe 9 leading from the steam space of. the boiler;

the connection being controlledby the valve 23. V

The drum 5 is shown as being supported from a point below the level of the bottom of the boiler 1.

The drum 5 has no communication with the boiler 1 otherwise than by way of the tubes 3.

At about the level of the bottom of the boiler 1, between the boiler 1 and the drum 5, is a water box or drum to which are lied downcomer pipes 11 from the drum -il and from which are led the upcast circulating tubes 6 connected to the back of the boiler about the water level therein as SliUWll in Fig 1; plies 12 connect the water box or drum 10 with the bottom of the boiler l.

The disposition of the connections is such that feed water admitted to theeconoinizer circulates between the drums at and 5, a certain proportion flowing from the drum 4 to the water box or drum 10 and there joining water circulating between the water box or drum 10 and the boiler 1 as shown in Fig, 1.

- Between the economizer tubes 3 and the upcast circulating tubes 6 is a steam snperheater comprising preferably substantially vertical or slightly inclined tubes 13 which may be joined at their upper ends to a drum 14 with an internal partition 15 separating the saturated steam inlet from the superheated steam outlet, Fi 1, and at their lower 7 ends to a drum 16 or the like; or the drums 14 and 16 may be replacedby headers or boxes, Fig. 2.

In all cases the superheater, it provided, is screened by the water circulating tubes 6 which take up a suitable proportion of the heat from the gases leaving the boiler t'urnace.

In Fig. 1 the drum 10 is shown supported by a spring butler support 17. In Fig. 3 the drum 10 is shown as supported by an in clined plane support 18.\vith co-operating ro ler 19. In Fig. l the drum It] is shown su ported by a swinging arm connected to L irder 21.

cilaim 1. Astealn generating plant comprising a boiler of the cylindrical type, an economizer spaced from the back end of the boiler and comprising upper and lower drums and sub stantially vertical tubes connecting said drums, a connection between the steam space of the upper drum and the steam space of the boiler, the lower drum being unconnected with the boiler otherwise than by way of said tubes, a water box at about the level of the bottom of the boiler, a connection between said water box and the lower side of the boiler, upcast circulatin tubes led from said water box to the back 0 the boiler, said circulating tubes being located nearer the back end of the boiler than said first-mentioned tubes, and a downcomer connection from said upper drum to said water box.

2, A steam generating plant comprising a boiler of the cylindrical type, an economizer spaced from the back end of the boiler and comprising upper and lower drums andsubstantially vertical tubes connecting said drums, a connection between the steam space of the upper drum and the steam space of the boiler, the lower drumbeing unconnected with the boiler otherwise than by way of said tubes, acircnlating system comprising. a

water box at about the level of the bottom of the boiler, a connection between said water box and the bottom of the boiler, upcast circulating tubes led from said water box to the back of the boiler at a point at about the water level in the boiler, said circulating tubes being located nearer the back end of the boiler than said first mentioned tubes, means for supporting saidwater box in a manner to permit downward expansion of said circulating tubes and a downcomer connection from said upper drum to said Water box. 1 i

A steam generating plant comprising a boiler ot' the cylindrical type, an economizer spaced from the back end of the boiler and comprising upper and lower drums and substantially vertical economizer tubes connect ing said drums, a connection between the steam space of the upper drum and the steam space of the boiler, the lower drum being unconnected with the boiler otherwise than by way of said tubes, a water box at about the level of the bottom of the boiler, a con nection between said water box and the lower side of the boiler, upcast circulating tubes connecting said water box with the back of the boiler near the water level, said cir- (diluting tubes located nearer the back end of the boiler than said economizer tubes, a downconier connection from said upper drum to said water box, a superheatcr including an upper manifold having a saturated steam inlet connected to the steam space of the boiler, a connection between said upper drum and the steam inlet side of said manifold, and superheater tubes located intern'iediate the cconomizer tubes and the circulating tubes.

In testimony whereof I have signed my name to this specification.

JAMES HQWI HJN HUME.

Bil 

